SPI Communication Pin configuration

[xuezhi_zed]

I am using a customized PCB (nrf52840) and I have been successfully set up the SPI communication in between the nrf and lsm6dso 

I used 0.11 as clk , 0.27 as MISO and 0.25 as MOSI , I have attached the code i used in the overlay file, and it was working 

&spi0{
    compatible = "nordic,nrf-spi";
    status = "okay";
    // cs-gpios = < &gpio0 13 GPIO_ACTIVE_LOW>;
    pinctrl-0 = <&spi0_default>;
    pinctrl-1 = <&spi0_sleep>;
    pinctrl-names = "default","sleep";
    
};
&spi1{
    compatible = "nordic,nrf-spi";
    status = "okay";
    // cs-gpios = < &gpio0 4 GPIO_ACTIVE_LOW>;
    pinctrl-0 = <&spi1_default>;
    pinctrl-1 = <&spi1_sleep>;
    pinctrl-names = "default","sleep";
    
};

    



&pinctrl {
    
    spi0_default: spi0_default {                 
        group1{
            psels = <NRF_PSEL(SPIM_SCK, 0, 11)>,
				<NRF_PSEL(SPIM_MISO, 0, 27)>,
				<NRF_PSEL(SPIM_MOSI, 0, 25)>;
        };
    };
    spi0_sleep: spi0_sleep {
        group1{
            psels = <NRF_PSEL(SPIM_SCK, 0, 11)>,
            <NRF_PSEL(SPIM_MISO, 0, 27)>,
            <NRF_PSEL(SPIM_MOSI, 0, 25)>;
    };
    };
    spi1_default: spi1_default {
        group1{
            psels = <NRF_PSEL(SPIM_SCK, 0, 6)>,
				<NRF_PSEL(SPIM_MISO, 0, 8)>,
				<NRF_PSEL(SPIM_MOSI, 0, 7)>;
        };
    };
    spi1_sleep: spi1_sleep {
        group1{
            psels = <NRF_PSEL(SPIM_SCK, 0, 6)>,
				<NRF_PSEL(SPIM_MISO, 0, 8)>,
				<NRF_PSEL(SPIM_MOSI, 0, 7)>;
        };
    }; 
};

However, when I modify my PCB and change to the following list of pins , it stops working , and gives 0xFF

0.11 as clk,  0.7 as MISO , 0.25 as MOSI 

Any pin that I should not use or need to have additional setup ? 

&spi0{
    compatible = "nordic,nrf-spi";
    status = "okay";
    // cs-gpios = < &gpio0 13 GPIO_ACTIVE_LOW>;
    pinctrl-0 = <&spi0_default>;
    pinctrl-1 = <&spi0_sleep>;
    pinctrl-names = "default","sleep";
    
};

    



&pinctrl {
    
    spi0_default: spi0_default {                 
        group1{
            psels = <NRF_PSEL(SPIM_SCK, 0, 11)>,
				<NRF_PSEL(SPIM_MISO, 0, 7)>,
				<NRF_PSEL(SPIM_MOSI, 0, 25)>;
        };
    };
    spi0_sleep: spi0_sleep {
        group1{
            psels = <NRF_PSEL(SPIM_SCK, 0, 11)>,
            <NRF_PSEL(SPIM_MISO, 0, 7)>,
            <NRF_PSEL(SPIM_MOSI, 0, 25)>;
    };
    };
    
};

I am using nRF Connect SDK v2.5.2

2. Another question that I asked before and is solved by I did not get the reason, hope to clarify again

/ {
    user_dbg_pin: user-dbg-pin {
            compatible = "nordic,gpio-pins";
            gpios = <&gpio0 8 GPIO_ACTIVE_HIGH>;
            status = "okay";
    };
};

&gpio0 {
    status = "okay";
};

// &gpiote0 {
//     status = "okay";
// };

I used the above way to pull up P0.08 but the gpiote0 set up does not work. and I commented it out and it works. 

undefined node label 'gpiote0'

.

in which case I can use the set up below to turn on P0.08

#define MY_GPIO0 DT_NODELABEL(gpio0)
#define MY_GPIO1 DT_NODELABEL(gpio1)


gpio_pin_configure(gpio0_dev, GPIO_0_CS, GPIO_OUTPUT);
gpio_pin_configure(gpio1_dev, GPIO_1_INT1, GPIO_OUTPUT);
// gpio_pin_set(gpio0_dev, GPIO_0_CS, 1);
gpio_pin_set(gpio1_dev, GPIO_1_INT1, 0);

[Kazi Afroza Sultana]

Hello,

'' However, when I modify my PCB and change to the following list of pins , it stops working , and gives 0xFF

0.11 as clk,  0.7 as MISO , 0.25 as MOSI ''

Can you please check if pin 0.7 is being used by any other peripheral or function on your custom PCB?

[xuezhi_zed]

I double checked and it is only used for this MISO line. According to the datasheet, 0.07 is indicated as 'trace buffer clk' in nrf52840, does it matter.

Another question, for nrf52840, is there any thing such as this tutorial for nrf91 

https://docs.nordicsemi.com/bundle/ncs-2.6.0/page/nrf/config_and_build/configuring_app/hardware/use_gpio_pin_directly.html

Cuz when I use gpio_pin_configure and set , it does not work for P0.08

 

#define MY_GPIO0 DT_NODELABEL(gpio0)
gpio_pin_configure(gpio0_dev, GPIO_0_CS, GPIO_OUTPUT);

[Kazi Afroza Sultana]

xuezhi_zed said:

I double checked and it is only used for this MISO line. According to the datasheet, 0.07 is indicated as 'trace buffer clk' in nrf52840, does it matter

It could be a reason as this is used for TRACE BUEFFER. Maybe you can try another pin? Here is case (+) Using P0.07 as GPIO, not TRACECLK (nRF52840-QFAA-F-7) - Nordic Q&A - Nordic DevZone - Nordic DevZone where customer changed P0.07 to another pin to get the led driven.

''Cuz when I use gpio_pin_configure and set , it does not work for P0.08''

can you check if this pin P0.08 is not used by another peripheral? 

[Kazi Afroza Sultana]

Hello,

One thing I have noticed now. A duplicate ticket (+) Nordic DevZone which has been corresponding by my colleague. Where would you like to proceed for further correspondence?

[xuezhi_zed]

''Cuz when I use gpio_pin_configure and set , it does not work for P0.08''

can you check if this pin P0.08 is not used by another peripheral? 

- May I confirm that , if it is used by another peripheral , what I need to do is to disable that in overlay file? 

“Pin 8 of &gpio0 already assigned to 2 other nodes

nrf52840dk_nrf52840.dts(158, 1): Overlapping assignment” 

Then what I need to do is - 

&uart0{  status = "disabled";};